In MediaRecorder when i start to capturing a video it's create beep sound.
also it's play beep sound when i stop the recording.

So How to i off this sound.

Screenshots from README.md are missing. They just don't exist anymore according to github

The project is from Google?

does not request for permissions

When importing into Android Studio version:

Android Studio 3.2.1
Build #AI-181.5540.7.32.5056338, built on October 9, 2018
JRE: 1.8.0_152-release-1136-b06 x86_64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
macOS 10.14.1

I get the following error:

No toolchains found in the NDK toolchains folder for ABI with prefix: mips64el-linux-android

This is almost certainly because the NDK no longer supports the MIPS architecture.

19-01-10 11:29:54.952 23158-23184/com.example.android.mediarecorder E/libc: Access denied finding property "vendor.gralloc.enable_ahardware_buffer"
2019-01-10 11:30:06.683 23158-23227/com.example.android.mediarecorder W/CameraBase: An error occurred while connecting to camera 0: Status(-8): '1: validateClientPermissionsLocked:906: Caller "com.example.android.mediarecorder" (PID 10279, UID 23158) cannot open camera "0" without camera permission'
2019-01-10 11:30:06.692 23158-23227/com.example.android.mediarecorder E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.example.android.mediarecorder, PID: 23158
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:354)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
at java.util.concurrent.FutureTask.run(FutureTask.java:271)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:764)
Caused by: java.lang.RuntimeException: Fail to connect to camera service
at android.hardware.Camera.(Camera.java:546)
at android.hardware.Camera.open(Camera.java:410)
at com.example.android.common.media.CameraHelper.getDefaultCameraInstance(CameraHelper.java:103)
at com.example.android.mediarecorder.MainActivity.prepareVideoRecorder(MainActivity.java:142)
at com.example.android.mediarecorder.MainActivity.access$000(MainActivity.java:44)
at com.example.android.mediarecorder.MainActivity$MediaPrepareTask.doInBackground(MainActivity.java:218)
at com.example.android.mediarecorder.MainActivity$MediaPrepareTask.doInBackground(MainActivity.java:213)
at android.os.AsyncTask$2.call(AsyncTask.java:333)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
at java.lang.Thread.run(Thread.java:764) 
2019-01-10 11:30:06.817 23158-23227/com.example.android.mediarecorder I/Process: Sending signal. PID: 23158 SIG: 9

Almost certainly because of failure to ask for runtime permissions.

with Android Studio 2.3.3 (both Windows and Mac) I get:
Gradle sync failed: This Gradle plugin requires a newer IDE able to request IDE model level 3. For Android Studio this means version 3.0+

what's going on here?
this is now the third Sample project and they all are not tested / kept up / maintained?

and why do I want (as some web search suggested) to mess with the code and use some work-around adding some other side-effects??

can't we expect clean, working code?

frustrated,
jm.

By click on "Capture" button app Crashes

FATAL EXCEPTION: AsyncTask #1
Process: com.example.android.mediarecorder, PID: 30676
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.IllegalStateException
at android.media.MediaRecorder.start(Native Method)
at com.example.android.mediarecorder.MainActivity$MediaPrepareTask.doInBackground(MainActivity.java:222)
at com.example.android.mediarecorder.MainActivity$MediaPrepareTask.doInBackground(MainActivity.java:214)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
at java.lang.Thread.run(Thread.java:841) 

FATAL EXCEPTION: AsyncTask #1
Process: com.example.android.mediarecorder, PID: 30676
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.IllegalStateException
at android.media.MediaRecorder.start(Native Method)
at com.example.android.mediarecorder.MainActivity$MediaPrepareTask.doInBackground(MainActivity.java:222)
at com.example.android.mediarecorder.MainActivity$MediaPrepareTask.doInBackground(MainActivity.java:214)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
at java.lang.Thread.run(Thread.java:841) 

By click on "Capture" button app Crashes

08-26 14:33:10.771 23481-23822/com.example.android.mediarecorder E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
Process: com.example.android.mediarecorder, PID: 23481
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.RuntimeException: start failed.
at android.media.MediaRecorder.start(Native Method)
at com.example.android.mediarecorder.MainActivity$MediaPrepareTask.doInBackground(MainActivity.java:208)
at com.example.android.mediarecorder.MainActivity$MediaPrepareTask.doInBackground(MainActivity.java:200)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:818)
08-26 14:33:11.651 23481-23506/com.example.android.mediarecorder E/OpenGLRenderer﹕ SFEffectCache:clear(), mSize = 0